Arbitrage Funds — Equity by Classification, Not by Behaviour

The same share can trade at slightly different prices in two markets at the same time: in the cash market, where you buy the share itself, and in the futures market, where a contract on that share settles at a later date.

An arbitrage scheme buys in one and sells the matching position in the other at the same time. Because both sides are held together, it does not matter much whether the share rises or falls; the scheme is capturing the difference between the two prices, which converges as the contract approaches settlement.

So the portfolio holds shares, which is why the category sits under equity, while the market view that usually comes with holding shares has been deliberately cancelled out. Our page on what a mutual fund is covers the underlying structure.

The reason this category exists in the form it does is largely a tax one, and it is the honest explanation for its popularity.

Because the portfolio is predominantly in equity, the scheme is treated as an equity scheme for taxation, which is a different treatment from a debt scheme even where the behaviour of the two is broadly comparable. For somebody in a higher bracket parking money for a few months, that difference can matter.

Rates and definitions here have changed more than once, so confirm the current position rather than relying on what was true a few years ago. Our page on mutual fund taxation explains the structure without quoting figures that date, and we are distributors rather than tax advisers.

The spread between the two markets is not a constant. It widens when there is a lot of activity and narrows when there is not, and a manager can only capture what the market offers.

That means results vary with market conditions in a way people do not expect from something described as low risk. In quiet stretches the available spreads are thin and outcomes are correspondingly modest, occasionally below what money would have done sitting elsewhere with less complexity.

The risk here is not that the scheme collapses. It is that it does considerably less than somebody assumed, over exactly the short period they were counting on it for.

Three things get claimed for this category that do not hold, and each has caused somebody to be disappointed.

It is not a deposit. There is no committed amount and no assured outcome, and the value can move, even if it usually moves less than an equity scheme would. Anybody wanting certainty about a figure on a date is asking for something a mutual fund of any category cannot provide, as our page on mutual funds versus fixed deposits sets out.

It is not a growth holding either. Cancelling out the market view also cancels out the reason equity is held for long periods in the first place, so using it for a fifteen-year goal misunderstands what it is for.

And it is not free of cost. The scheme charges an expense ratio and trades frequently by design, and against modest gross outcomes that cost is a larger share than it would be elsewhere, which our page on the expense ratio explains.

These schemes are used for short parking, which makes the exit load structure more relevant here than almost anywhere else.

Many arbitrage schemes apply an exit load on units redeemed within a short window measured in weeks rather than years. Against modest gross outcomes over a few months, a charge of that kind can take a meaningful share of what was earned, which is not the case for somebody holding an equity scheme for a decade.

The scheme states its own load in its documents and on the fact sheet, and it varies between schemes. Checking it before investing takes a minute and is worth more here than the comparison of past outcomes that people spend far longer on. Our page on the scheme fact sheet shows where that entry sits.

In practice we see it in a narrow set of situations rather than as a core holding.

• Money with a horizon of some months, too long for a liquid scheme to be the obvious answer and too short for equity.
• The receiving end of a transfer plan, where a lump sum is being moved gradually into equity, as our page on the systematic transfer plan describes.
• Somebody in a higher tax bracket for whom the classification difference is meaningful on a short parking of funds.

For a household still building its buffer, a liquid scheme or a deposit is the simpler answer and simplicity has value, which our page on building an emergency fund sets out.

Four checks, and the first is the one people skip.

• Is this genuinely short-horizon money, or is it long-horizon money being kept somewhere comfortable?
• Do you understand that the outcome varies with market activity and is not a set figure?
• What does the scheme charge, and what is the exit load in the first weeks?
• Would a liquid scheme do the same job more simply for your holding period?

We are mutual fund distributors and not investment advisers, and we do not recommend schemes on this site. If you want to talk through where a particular pot of money belongs, given when you need it, get in touch, and if the wider question is how the categories fit together, how to choose a mutual fund sets out the order.